The Royal Opera House did not tell the Royal Ballet School about sexual misconduct allegations against a resident choreographer for six months.
The allegations against Liam Scarlett were reported to the Charity Commission in October. The school was only told late in January that the claims might relate to some of its students.
The Royal Opera House has defended the delay, saying "we followed our safeguarding obligations throughout and notified the Royal Ballet School when it was appropriate to do so".
Scarlett was suspended in August.